Furnace for boilers.



A. HOCK.

FURNACE FOR BOILERS.

APPLICATION FILED JULY 15. 1913.

Patented July 13, 1915.

COLUMBIA PLAN ccccccccccccccccccccccc c.

Arama c cope Anne HOCK, or ntnm-zscnnonwrrz, NEAIRID'RESDEN,1GEB1VIANY.

FURNACE non BOILERS.

Application 'filed'il'uly 15, 1913. Serial No. 779,196.

To all whom it may concern:

Be it known that I, ARNO HOOK, engineer, citizen of Germany, subject of the King of Saxony and of the Emperor of Germany, residing at Klein-Zschachwitz, near Dresden, in the Kingdom of Saxony and Empire of Germany, have invented new and useful Improvements in Furnaces for Boilers, of Which the following is a specification.

The present invention relates to an improvement in furnaces for boilers, for instance steam boilers, and in particular such boilers which shall burn for 8-12 hours Without any attendance. The object of they present invention is to render the furnace serviceable for the use of various kinds of fuel, and to improve the utilization of these fuels.

A further'objec't of the present invention is to improve the supply of the additional combustion air and to automatically control the entrance ofthis additional air supply in such a manner, that at the-commencement of the workingofthe respective boiler, a larger quantity of air Willenter, and the supply is then gradually reduced untilat last the supply of'additional-air i's'completely cut 'ofl'.

The invention is hereinafter described with reference to the accompanying drawing, which shoWs a preferable constructional form o f theisubject matterof the presentinv'ention in combination With a sectional boiler.

The boiler shown in the drawing :consists of several sections (3,Wl1l6h are connected with each other in a suitable manner, and which form a furnace chamber 7) and hori zcntally extending lines o, 0 c 0 for the hot gases. These lines communicate with each other alternately at the front and at the rear side of the boiler, so 'that'the hot gases have to travel along a zig-zag shaped ath.

P d are the Water spaces of the boiler; e is the-escape flue for the smoke gases; at 7" the hot Water or steam leaves the boiler; g is a grate formed by a number of bars, Which may be of any suitable type, for instance a Water-cooled grate; h is the ash pit, which is preferably formedby the feet cast to the individual sections.

As usual the air enters through an opening 71 in the ash pit, and rises upward through the grate to the fuel. WI'th ordinary furnaces the air then first :passes through the lower layers of fuel, which are Specification of Letters Patent.

iPa'tent'edJuly 13, 1915.

in a hot glow and the hot gases then pass through the upper, not yet glowing layers of fuel. VVi-th fuels containing much gases this will have the result that the whole stool: of fuel is coke'd before it is ignited. lVi-th some kinds -of fuel, such as lignite, this is not advisable, and, on the contrary it Will often be preferable, that "the air, coming from above, passes dOW'II through the not yet glowing layers "of fuel to that part "of the fuel Which is already aglo'vv; After "they have then passed through these glowing layers the hot gases mix with the air entering from below, and a very good combustion is obtained. This method of firing is particularly advantageous at the commencement of the Working of the boiler, Whereas after some time, the air supply from below may gradually be reduced and cease en ti=1-e-1y, at the same rate as the fuel isflgasified. This object is obtained by means of the furnace inset hereinafter described. In the rear part-of the furnace chambera box:

shaped inset 7c is removabl'y fitted. This inset preferably has on its front side incli-ned Wall 76 with openings Z. Below the inset is partly o'losed by a bottom at, vvhieh rests on the grate, so that air can enter into the inset only through the rear partof the grate g Which is provided With suitable passages, as indicated by the arrows. The rearinost section of the boiler has two 'Walls -and m which form duct a The inset 7c is fitted between the "lovver ends of the Walls, a and a and communicates by means of an opening y) in its rear Wall with the uptake duct-o "formed by said Walls. This duct "0 leads above into the first fine '0. "The under-most water filled cross piece of the penultimate boiler section a is of such a length that between its iea'rend and the upper end of the Wall w, an opening '1' is formed leading from the furnace chamber directly'to the first 'fiue The"co1nbus'ti-on air, entering the furnaeechanfber usual through the grate-"can thus pass in {the usual manner through the coal heaped on the Owing to the arrangement of air entering -'through the openings 59 The front Wall supporting a part of the fuel stock, said front wall having openings forming a communication between the furnace chamber and the interior of the inset-body and an entrance for the hot gases, said inset-body being closed below in its front part while at the rear part an opening is provided forming a communication with the ash pit and an entrance for the additional air, the rear wall of said inset-body having an opening adapted to serve as an outlet for the air and the hot gases, an inclined wall in said inset arranged in the rear part of the inset body above the lower opening thereof, and forming a horizontal slot with the bottom of said inset, a passage leading from the said opening in the rear of the inset to the first boiler fiue, and an opening forming a communication between the furnace chamber and the first flue.

5. In a boiler furnace having a chamber with a grate, a furnace inset consisting of a box-shaped inset-body arranged upon said grate and having an inclined front Wall supporting a part of the fuel stock, said front wall having openings forming a communication between the furnace chamber and the interior of the inset-body, said inset-body having an opening on its lower side adapted to form a communication between its interior and the ash pit and an opening in its rear wall adapted to serve as an outlet for the air and the hot gases, a passage leading from the said opening in the rear of the inset-body to the first boiler flue and an opening forming a communication between the furnace chamber and the said first flue, a gate operable from outside adapted to close the said passage and the communication between the furnace chamber and the first flue respectively.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARNO HOCK. Witnesses:

PAUL ARRAs, CLAIR SIMON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

